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KLEINFELDER File No. 20-3978-01.W 10 July 26, 1997 11)Six suspected landfill/bum dump locations were identified on the Spreckels property during this assessment. Wastes known to have been disposed of on site via landfilling or burning include garbage, lead acetate and asbestos. Wastes suspected of being disposed of via landfilling include waste oil, empty and/or full 55-gallon storage drums, spent capacitors (PCBs), and empty pesticide/herbicide containers. The landfill locations identified on Plate 2 are approximate, and it is possible that additional landfill sites are present. The six sites identified during this assessment should be evaluated. Possible investigative methods include trenching, geophysical surveys, and infrared surveys. 12)Several existing and historical aboveground storage tanks (existing/former fuel oil tanks, caustic and acid storage, waste oil and diesel fuel) are located throughout the site. Underground piping is associated with the fuel oil tanks. Additionally, several existing and historical hazardous materials storage areas (the chemical warehouse, the temporary flammable materials storage units, the agricultural chemical storage shed, etc.) and hazardous materials points of use (the machine shop, the boilers, the engine and generator room, the former heater house etc.) are also located on site. Recent handling and spill prevention practices included spill containment structures, employee training and prompt documented clean up of spills. An example would be the clean up and documented closure of the chemical warehouse fire or the fuel oil pipeline leak. However, historical spill response and prevention was most likely not as stringent. An example would be the internal Spreckels memo regarding significant spillage of diesel fuel during vehicle refueling. It is recommended that soil sampling be conducted to evaluate the condition of soils at the existing/former aboveground storage tank locations (including an evaluation of underground product piping), and at the existing/former hazardous materials storage locations. The soil sampling could be conducted in conjunction with demolition of these features, or after demolition provided that the a survey is conducted to accurately document the proposed sampling locations. Any piping and/or tank removals should be done with the approval of and under the observation of EHD and our representatives. 20-3978-01.WI012017LI55 Page II of 50 Copyright 1997,Kleinfelder,Inc.